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Phase Change Material with Gelation Imparting Shape Stability.

Gleb Vasilyev1, Naama Koifman2, Michael Shuster3

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Shape-stable phase change materials (PCMs) were developed using gelators and nanomaterials. Graphene nanoplatelets significantly enhanced strength and thermal conductivity, enabling applications in solar-thermal systems.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Bio-based phase change materials (PCMs) offer sustainable thermal energy storage but often lack shape stability.
  • Immobilizing PCMs is crucial for preventing leakage and enabling practical applications.

Purpose of the Study:

  • To develop shape-stable bio-based phase change materials (PCMs) for near-ambient temperature applications.
  • To enhance the mechanical properties and thermal conductivity of PCMs using gelators and nanomaterials.

Main Methods:

  • Blending two gelators (12-hydroxystearic acid and Millithix MT-800) to immobilize CrodaTherm 29.
  • Incorporating multiwalled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GnPs) into the gelled PCM above their percolation thresholds.

Main Results:

  • A 15 wt % gelator concentration effectively prevented PCM leakage.
  • Graphene nanoplatelets (3.0 wt %) improved PCM strength by ~1.5-fold and thermal conductivity by ~65%.
  • MWCNTs (up to 0.6 wt %) showed diminished strength and increased leakage, with only slight thermal conductivity improvement.

Conclusions:

  • Gelation successfully imparted shape stability to the bio-based PCM without significantly altering its thermal behavior.
  • Graphene nanoplatelets are promising additives for enhancing the performance of shape-stable PCMs.
  • The developed shape-stable PCMs are suitable for solar-thermal installations, including greenhouses and net-zero energy buildings.